I read that genetic drift is random variation in the relative allele frequencies of a population.
This question however seems to pin genetic drift down to increasing deleterious allele frequencies. Is the answer to this question correct? I don't think that increase of a deleterious allele necessarily indicates that genetic drift is operating; it suggests genetic drift, because one would think that such alleles should decrease in frequency rather than increase, but random chance in a large population can also increase the frequency of deleterious alleles.